Well, based on my limited knowledge, I would say:
- Zeal’s Zeal® Transparent Gold Plated Screw-in Stabilizers V2 - Zeal Generation Inc.
- Durock - https://keygem.store/collections/stabilizer/products/durock-stabilizer
- Cherry - Official Cherry MX Stabiliser Pack (4x2u x 6.25u) | Candykeys
- C3
But, I would also love to know the opinions of more knowledgable people!